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Comments:
I picked this UI because it shows plenty of information, but doesn't look cluttered or blocky, and keeps most the UI out of the middle of the screen. I also like the custom neon class colors.
I don't like the pixel font, finding it ugly and hard to read (I'm very nearsighted, with astigmatism). I also feel that it has too many action buttons (I'm a keybinder). Finally, I prefer a more distinct border between UI elements and the game world than the thin black line used in this UI.

Comments:
I chose this UI because it's the one that shows information in the most clear way possible. Nothing is cluttered and the most important elements stand out to me at a glance.
I also enjoy the pixelfont since, unlike Phanx, I am not a bat.

__________________All I see is strobe lights blinding me in my hindsight.

Comments:
I liked this one the most because overall I prefer most of the information to be displayed at the bottom, although in my opinion this particular UI has some flaws, but out of those few this one would satisfy my needs the most. The main thing about this UI is that it's universal, i.e. due to informative raid frames it would fit needs of any class whether it's healing, damage dealing or tanking.
I also want to mention few main things I'd like to change: first of all, no one ever needs that many visible action buttons, this could be improved in many ways, for example using invisible action bars, secondly even though latterbox panels in some cases could be considered as design improvement, but in this UI it just adds unnecessary clusters, and lastly I don't like duplicating the information like in this case for example cooldown bar's functionality can be held by action bars or the filtering add-on.

Comments:
I picked this UI because it shows all the information that I need to know while keeping everything as clean, and simple as possible. The information is sitting in the center of the screen without impairing any vision of the game world.
I usually dislike pixel fonts, since they can be hard to read even with my glasses, but I can read the text fine in this UI, and most of the time I can get the information with just a glance.

Name: T. McMahon

__________________
"This is the fifteen-thousandth four hundredth and ninety-eighth occurence".

I think you need to re-read the original post. This is not a "post your UI" thread. The OP is doing a research project, and asked people to look at a series of UI screenshots (link in his post) and describe which of those UIs they preferred.

Comments
Not realy keen on any UI that places elements top and bottom of screen. While cluttered in the center (again not my favourite) this one appears to have most of the vital information in the one area.

Picked this UI as it shows all the necessary information without much clutter. Also doesn't seem patchy as all the colours/layouts are coherent and the UI elements are kept out of the middle/upper part of the screen.